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Патент USA US2125505

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Aug. 2, 1938.
Filed March 5, 1954
Frdrr/r ?rz‘ 52,
Patented Aug. 2, 1938
Frank Kritz, Detroit, Mich.
Application March 5, 1934, Serial No. 714,010
1 Claim.
('01. 192-—33)
This invention relates to clutch control mechanism, and is particularly, though not necessarily,
adapted to control windshield wipers which de-
rive power from a rotating element, whether that
5 element be a usual part of an internal combustion engine or any other rotating element such,
for instance, as the shaft of an electric or other
Principal objects include the provision of a
10 clutch control mechanism for windshield wiping
clutching means being so constructed and ar
ranged as to disengage the driven shaft from the
driving shaft upon an abnormal resistance to
moving the driven shaft.
The above being among the objects of the 5
present invention, the same consists in certain
novel features of construction and combinations
of parts to be hereinafter described with refer
once to the accompanying drawing, and then
claimed, having the above and other objects in 10
mechanisms or the like so constructed and ar-
ranged as to employ a portion of the power being
transmitted through it for the purpose of convtrolling its operation; the provision of a control
In the accompanying drawing which illustrates
suitable embodiments of the present invention
and in which like numerals refer to like parts
15 head or unit including a servo mechanism for
throughout the several different views,
controlling the application of power therethrough; the provision of' a control head or unit
for windshield wiper mechanism including a
drive shaft and a servo mechanism driven by the
20 drive shaft and controllable to limit the discontinuan-ce of power transmission through the control head or unit to a predetermined position‘of
Fig. 1 is a more or less diagrammatic, partially
broken, fragmentary, vertical sectional view
taken longitudinally through the center of a
motor vehicle‘ and particularly that part thereof
including the engine and windshield and asso- 20
ciated parts, and illustrating a windshield wiper
mechanism constructed in accordance with the
operation of the wiper blade driven thereby regardless of the time at which the servo mecha25 nism is placed in a condition to limit the application of power therethrough; the provision of a
control head or unit including a rotatable shaft
and a worm and wheel constantly driven thereby
and means cooperable with said worm in one
position only of rotation thereof for discontinu-
teachings of the present invention cooperatively
associated with the windshield and deriving its
power for operation from the engine.
Fig. 2 is an enlarged side elevational view of
ing the application of power through the shaft;
and the provision of a control head or unit ineluding a rotating shaft and gearing constantly
driven thereby together with a manually operable
35 element capable of being moved to a position of
- control head inoperativeness at any time during
the operation of the gear mechanism but so oon~
structed and arranged as to be actuated by an
the power head or unit employed in the wind
shield wiper construction illustrated in Fig. l,
part of the casing being broken away to disclose
certain details of the construction within the 30
casing, the mechanism being shown in operative
Fig. 3 is a View similar to Fig. 2 except that the
control lever and the cover for the casing has
been removed to better disclose the parts con- 35
tained within the casing, and indicating the posi
tion of the mechanism when in inoperative
element of the gear mechanism only when such
40 element has substantially reached a predetermined point in its rotatable path, together with
means cooperatively associated with the control
element for terminating the flow of power
through the control head or unit; the provision
45 of a control head or unit for windshield wiper
mechanism including a control head or unit having a driving and a driven shaft, gearing driven
Fig. 4 is a vertical sectional view taken on the
line 4—4 of Fig. 3.
Fig. 5 is a vertical sectional view taken on the
line 5—5 of Fig. 3.
The illustrative windshield wiper mechanism
shown in Fig. 1 includes two main units which
for thevsake of convenience I term “heads” and 45
which consist of an operating head by means of
which the windshield wiper blade is caused to
by_ the driven shaft and means operated by the
gearing “and subject to manual control for dis-
oscillate or otherwise move in a desired path of
travel and a control head suitably connected to
the operating head and so constructed and ar- 50
ranged as to control the transmission of power
from the source of power to the operating head.
As ‘a matter of illustration only, in the accom
panying drawing a preferred embodiment is
shown in which the operating head is mounted 55
50 conn’e‘ctingthe driving and driven shafts when
one of the elements’of the’ gearing'has reached
substantially a predetermined point in its rotatable‘ path; and the‘ provision of-a" control head or
unit-including a driving and ‘a driven shaft and
55 clutching means for connecting-said‘shafts,jthe
in a suitable location adjacent the windshield of
The control head 52 is provided with a control
a motor vehicle so as to enable it to operate a 'lever 60 which, when necessary, may be con
windshield wiper blade across or over the wind
shield surface, and the mechanism
illustrated as deriving its power from a rotating
part of the power plant of the vehicle upon
which it is mounted, the particular part selected
in the present case as a means of illustration
comprising the shaft of the usual electric gener
ator, and
the control
by the
has beenItshown
may be
noted that it is preferable, although not neces
sary, that the device supplying the power to the
windshield wiper mechanism be located outside
15 of the passenger compartment of the motor vehi
cle in order to eliminate as far as possible the
sensible effect of the operating sounds thereof
from the passenger compartment.
Referring now to the drawing, and particularly
to Fig. 1, there is indicated generally at 20 an
internal combustion engine for a motor vehicie,
the engine being provided with the usual electric
generator 22 suitably driven from the crankshaft
of the engine by means of a beit 24 in accordance
25 with conventional practice.
Over the engine 20
is positioned the usuai hood 2%, the rear edge of
which rests upon the upper edge of the usual
dash 28.
Extending rearwardly from the dash
28 is the usual cowl 30, the upper rear edge of
which is bent upwardly as at 32 and then rear
wardiy as at 34 to provide a shelf against whic
the usual sealing strip 35 positioned in the frame
38 of the windshield 4!] may contact to seal the
space between the windshield 48 and the cowl.
35 In the particular construction shown a Z-sec
tioned member 42 is secured to the underface of
the portion 34 of the cowl 30 and extends trans
versely of the windshield opening and to the
upper leg of the member 42 is suitably secured
the usual instrument panel 44 which, of course,
is located within the driving compartment of the
In the particular embodiment of the invention
shown the windshield wiper mechanism includes
an operating head mounted against the lower leg
of the Z-sectioned member 42, its operating shaft
projecting forwardly and upwardly through the
portion 32 of the cowl and upon the projecting
outer end of the shaft is suitably secured an oper
atinnr arm (i8 of a windshield wiper blade 59
adapted to be oscillated back and forth across
the face of the windshield 40. The particular
nected to a remote point of manual control such
as the button 62 suitably mounted upon the in
strument panel 46 and connected with the lever
66 by any suitable linear transmission device
which may be, for instance, of the well known
Bowden wire type.
Referring now to Figs. 2'to 5, inclusive, illus
trating the details of construction of the control 10
head 52, it will be noted that this includes a
casing 66 having a cover 68 closing one side face
thereof. The drive shaft 58 is positioned with
its axis centrally located between opposite sides
of the casing 66 and adjacent one edge thereof. 15
The nipple 54, in which the shaft 56 has bearing,
projects within the casing and internally thereof
is provided with a shoulder ‘it which is drawn
against the inner face thereof by a lock nut 12
which thus serves to secure the nipple Eli ?rmly
in place. Immediately inwardly of the shoulder
‘id the shaft 56 has secured thereto a collar mem
ber ‘l4 having formed on its axially inner surface
two ratchet teeth ‘l6, and rotatably mounted
upon the shaft 5% inwardly beyond the collar 25
member i4 is a clutch sleeve 18 having ratchet
teeth 86, complementary to the teeth 76, formed
on that end thereof opposed to the collar member
The shaft 55 terminates at a point approxi
mately midway the length of the sieeve member 30
78, as indicated in Fig. 3 by dotted iine.
‘In the end of the casing opposite to the shaft
56 in axial alignment therewith and secured in
place by a nut 82 is a bushing 84 in which the
driven shaft 86 is rotatably received. The shaft
86 projects through the bushing 84 into the cas
ing and its inner end is received within and has
bearing in the corresponding end of the clutch
sleeve 78. Within the casing the shaft 86 is
provided with a worm 88 ?xed thereto together
with a collar member 90 having diametrically
opposed axially extending teeth or keys 92 formed
on the inner end thereof and which keys slidably
but non-rotatably interengage with a diametri
cally disposed slot 94 formed in the corresponding it
end of the sleeve member 18. ‘The outer end
of the shaft 86 has ?xed thereto a flexible linear
transmission member 96, which, as indicated in
Fig. 2, may take the form of a plurality of tele
scoped close coiled helical springs wound in alter 50
nately opposite directions and it is through this
member 955 that power is transmitted from the
construction of the operating arm 48 and wiper
control member 52 to the operating head v46.
blade 50 is unimportant as far as the present‘
invention is concerned and any conventional or
Preferably, the member 96 is enclosed within a
known construction may be employed.
In the particular embodiment of the invention
shown the control head, indicated generally at
52, for the windshield wiping mechanism is shown
able type, one end of which is ?xed to the bushing
34 and the opposite end of which is ?xed with
respect to the control head 46 in a well known
mounted on the rear end of the generator 22.
This control head, as indicated in Figs.»2.and 3,
is provided with a projecting’ threaded. nipple
54 through which the driving shaft 55 projects
and in which it has suitable bearing. In the.
present instance the nipple 54 is shown as thread
?exible tubular covering such as 98, of any suit- _
A block lilll is secured, in the upper right hand 60
corner of the casing 66 as viewed in Figs. 2 and 3
by means of screws I02 or other suitable means.
The block mu is centrally provided with an up
standing stud member I04 upon which a worm
wheel H25 in constant mesh with the worm B8, is
ed into the rear end of the casing for the gen
rotatably mounted. The worm wheel I06. is
erator 22 in concentric relation with respect to maintained in contact with the upper face of the
the operating shaft (not shown) thereof and the block in!) by .means of a collar I08 formed on
driving shaft v56 is adapted for suitable driving ' the stud I94. As indicated best in Fig. 5, the
70 connection with the operating shaft of the gen— . collar I98 terminates in spaced relation to the
erator in any'well known manner. A lock nut inner face of. cover 68 and the stud H14 projects 70
58 received on the nipple 5;! is provided for look
upwardly therebeyond through the cover 68. The
ing the control head 52 against inadvertent dis
lower face of the block I!!!) is provided with a
placement with respect to‘ the generator 22 about
is, ‘the
axisofthe nipple 54.‘ ‘
groove H0 extending in parallel relation'with
respect 't'o'the axes'of the shafts 56 and'86 and 75
slidably guided for movement in the groove “0
is a plate member “:2. As best illustrated- in
Figs. 2 and 3, the left hand end‘ of the plate
member I I2 projects beyond the left hand end. of
27k the block I00 and is thereiprovided» with an inte
gral rpstanding member I I4: the planeof which is
disposed in perpendicular relationship. with. re
spect to the axes of the shafts 56' and‘ 86. As
illustrated- in Figs. 2 and 3, the upper end‘ of the
member IE0 is extended into substantial. con.
tact with the upper wall of the casing 66 and the
lower end thereof is bifurcated and is received in
a peripheral groove IIS formed in the clutch
sleeve ‘I0. A spring H8 co-acting between the
15 casing 66 and the member H4 constantly urges
the members I I4 and H2 to the left as Viewed in
Figs. 2 and 3 and, through the engagement be
tween the member II4 and the clutch sleeve ‘I8,
urges the clutch sleeve ‘I8 into clutched relation
20 with respect to the collar ‘I4 through interengage~
merit of the ratchet teeth ‘I6 and 80, the sliding
interengagement of the keys 92 with the clutch
sleeve ‘I0 maintaining the driving relation between
the driven shaft 86 and the clutch sleeve ‘I8.
A. plate member I20 is relatively loosely re
ceived between the cover 68 and the upper end of
the collar I08 of the stud I04, the plate I20 being
provided with an L-shaped opening I22 therein
through the enlarged foot portion of which the
30 stud I04 freely projects. As best brought out
in Figs. 2 and 3, the left hand end of the plate
member I20 projects in overlapping relationship
with respect to the member I I4. and at the point
of overlap is provided with a neck portion I23
3.5 which is received in loosely interlocking relation
ship with respect to a notch I24 formed in the
upper edge of. the member I I4. From this it will
be noted that the plate member I20 and. the mem
ber H4 are connected together for interrelated
110 sliding movement.
As viewed in Fig. 3, the upper right hand edge
of the plate member I20 is provided with an in
wardly projecting lug I26, shown more clearly in
Fig. Ii. which extends into substantially contact
ing relationship with respect to the adjacent face
or else into intersecting relation with respect to
the path of travel of the pin I28. As will be ap
parent, when the control arm. 60 is in the posi
tion indicated in Fig. 2 the pin I36 will have
moved. upwardly. as viewed in that ?gure and
cause the right hand end of the plate member
I20 tobe moved upwardly carrying with it the
lug I26 and moving the. lug. I26 out of. the path
of travel of the pin I28. Likewise, it willbe noted
that when. the control arm 60 is moved to the 10
position indicated in Fig. 3 the pin I36 through
engagement with the walls of the opening I22
will. have caused the member. I20 to pivot about
the. neck I22 and move the right hand end thereof
downwardly so as to bring the lug I26 into inter 15
secting relation with respect to the path of travel
of the pin I28 of the Worm wheel I06.
The normal operative position of the mecha
nism is that indicated in Fig. 2 in which the con
trol arm 60 is moved to position the lug I26 out 20.
of the. normal path of travel of the pin I28 and
under such circumstances the spring II8 will
have urged the member II4, together with the
plate member I20, to the left as viewed in Figs.
and 3 and the plate member II4 will have 25.
moved the clutch sleeve ‘I8 to the left so as to
bring its ratchet teeth 00 into driving relation
with respect to the teeth ‘IE on the collar ‘I4.
Under such circumstances, if the shaft 56 is
rotating it will cause the sleeve member ‘I8 to be 3.0.
rotated and, because of the driving connection
between the sleeve member ‘I8 and the collar
member 90 by reason of the interengagement
of the keys 92 and slot 94, the collar member 90,
worm 80 and driven shaft 86 will be rotated
equally with the driving shaft 56. When the
worm 80 is thus rotated, because of its inter
engagement with the worm wheel I06, the worm
wheel I06 will also be rotated carrying with it
the pin I28.
When the control lever is in the position indi
cated in Fig. 2 the pin I36 ?xed thereto will
have moved the plate member I20 to a position
in which the lug I26 is outside of the normal
path of movement of the pin I28 on the worm 45
The worm Wheel I06 is
wheel I06 and consequently continued equal
provided with an upstanding pin I28 which is
adapted for engagement with the lug I26 in a
rotation of the shafts 50 and 86 will occur.
Should it now be desired to disconnect the driv
of the worm Wheel I06.
manner which will hereinafter be more fully ex
plained. The cover 08 is provided with a suit
able opening through which the stud I04 pro,
jects and, as illustrated in Fig. 2, is also provided
with an arcuate slot I30 therein having its
center concentric with the axis of the stud I04.
The control arm 60 is rotatably received upon the
projecting end of the stud I04 exterior to the
and is maintained thereon in substan
tial‘ contact with the cover 68 by means of a
washer I32 and nut I34.
The hub portion of the
.1; control arm 60 is made relatively large so as to
overlie the slot I30 and thus provide a shield for
the same to prevent the entrance of. dust or other
foreign matter through the slot I30 into the in
terior of the ‘casing 66.
The arm 60 has a pin I36 ?xed thereto and
which pin projects through the slot I30 in the
cover 03 and into the narrow part of the L
shaped opening E22 in the plate member I20, as
indicated in Fig. 3. By moving the control arm
TO Gil about the axis of the stud I04 the pin I36 in
engaging the plate member I20 may cause the
‘ plate member 520 to pivot about its point of con
nection with the member H4 at the neck I22
so as to bring the lug I26 either out of the path
75 of travel of the pin I28 on the worm wheel I06
ing and driven shafts 56 and 86, respectively,
the control lever 60 is moved from the position
indicated in Fig. 2 to the position indicated in
Fig. 3 and which movement, as has previously
been described, will cause the lug I26 to be
moved into intersecting relation with respect to
the path of travel of the pin I20. When this
is done, regardless of the particular rotatable
position of the pin I28 at the time of operation
of the control arm 60, continued rotation of the
worm wheel I06 will eventually bring the pin I28
into contact with the lug 26. When this occurs, 60
due'to the fact that the worm wheel I06 is being
driven under power from the shaft 56, the worm
wheel I06 will continue to rotate and will force
the lug I26 and plate member I20 to the right
as viewed in Figs. 2 and 3.
The plate member
I20 in moving to the right will, because of its
engagement with the member II4, cause the
member H4 and its connected plate member
II2 to move with it to the right. Upon moving
to the right the member I I4, because of its inter 70
engagement with the clutch sleeve ‘I8, will cause
the sleeve member ‘I8 to likewise move in the
same direction and, upon the necessary degree
of rotation, the worm wheel I06 will cause the
ratchet teeth ‘I6 and 80 to separate from each 75
other and thus disconnect the shaft 86 from the
driving shaft 56.
It is to be particularly noted that the only
effort on the part of the operator to place the
control head in inoperative position is that re
arate and slip overv one another. This construc
tion provides a safety means whereby possibility
of rupture of the mechanism is eliminated should
the wiper blade 50 become frozen to the wind
shield 40, in case the wiper blade 50 is manually
held against movement during operation of the
quired to move the control arm 60 which moves
only the plate member I20 and the latter, being
mechanism or forced to move when the mecha
nism is not operating or, if for any other reason
something occurs to prevent normal movement of
relatively free and loose, requires substantially
no effort in its operation.v
It is important to
10 observe that upon operation of the control mem
a part of the mechanism.
ber 60 and corresponding movement of the plate
member I20 the mechanism is so conditioned
that upon a predetermined point in the rotat
able position of the worm wheel I06 the source
15 of power for the drive shaft 56 will itself pro
vide the necessary power to actuate the mecha
nism to actually disconnect the driving shaft
from the driven shaft. Thus a servo mechanism
is necessary is to vmove the button 62 on the 15
instrument panel 24 to its inoperative position
which will-move the control arm 60 on the con
trol head 52 to its inoperative position and, upon
continued movement of the mechanism, the pin
I28 on the worm wheel I06 will be brought ‘into 20
contact with the lug I26 on the plate member
I26 and through the member IM power derived
from the driving means will cause the power
shaft to be disconnected from the windshield
wiping mechanism and this at a time that the 25
the rotation of the worm wheel I06 to mechani
cally relieve the driving connection between the
driving and driven shafts.
_ When the mechanism is in inoperative posi
tion as indicated in Fig. 3 and it is desired to
place it in operative position as indicated in Fig. 2
so that the driving and driven shafts 56 and 58,
respectively, will be joined for equal rotation,
windshield wiping mechanism including the
wiper arm 48 is in a predetermined position of
Upon disclosure of the teachings herein, those
skilled in the art will readily perceive various
all that is necessary is to move the control arm
60 from the position indicated in Fig. 3 to that
illustrated in Fig. 2, which movement will cause
pivoting of the plate member I20 about its neck
I 22 to disengage the lug I26 from the pin I28.
changes and modi?cations that may be made in
the speci?c embodiment of the invention de
scribed while still maintaining the principles of
construction and operation here disclosed and,
accordingly, it is to be understood that formal 35
changes may be made in the speci?c embodi
ments of the invention described without depart
ing from the spirit and substance of the broad
invention, the scope of which is commensurate
withthe appended claim. 6
35 As soon as this occurs the spring I I8 will force
the plate I20 and the member II4, together with
the clutch sleeve ‘I8, to the left as viewed in
Figs. 2 and 3 and again place the clutch mecha
nism in engaged position.
it is desired to discontinue its operation all that
is provided which, regardless of the time of ac
20 tuation of the control member, will be effective
in operation only at a predetermined point in
In accordance with the above explanation, it
will be apparent that when the windshield wip
ing'mechanism here described is operating and
It will be appreciated that the mechanism im
mediately associated with the operating head 42
is so arranged that when the pinion I66 of the
clutch control mechanism is in a stopping posi
tion, the windshield wiper blade 48 is in a posi
45 tion corresponding to a selected one of its limit
positions at the side of the normal ?eld of vision.
Referring particularly to Figs. 2 and 3, it will
be noted that the driving faces of the ratchet
teeth 16 and 80 are not in a plane parallel to the
axes of the shafts which they connect, but in
stead are slightly inclined with respect thereto
I claim:
In a mechanical power transmission system
having a driving shaft, a driven shaft axially
aligned therewith, and a clutch movable to con
nect and disconnect said shafts, the combination 45
of a member directly driven in rotation by one
of said shafts and having a laterally extending
projection offset from the axis thereof, a plate
positioned at one side of and in overlapping rela
tion to the member, said plate being slidably
guided for movement in a plane substantially 5,0
parallel i‘ to the plane of the member and having
and in such a manner that the turning force
transmitted through these teeth exerts an axial
a part operativelyv engaging the clutch, a shift- .
component tending to disengage the clutch. Un
able plate positioned at the opposite side of and
der ordinary conditions of operation the force of in overlapping relation to the member, for move
the spring II 8 acting through the member H4 ' ment in a plane substantially parallel to the plane 55
is sufficient to overcome the axial component of the member, said shiftable plate having a pro
of the force being transmitted between the shafts jecting part thereon for cooperation with said
56 and '86 tending to disengage the clutch, but projection and being operatively connected to
60 the inclination of the driving faces of the ratchet
said'?rst mentioned plate, and a control arm
teeth is so arranged that an unusual resistance connected to said shiftable plate and actuable to , 60
to oscillation of the wiper blade 50, for instance, pivot said- shiftable plate between a position in
will build up the force tending to separate the 7 which said projecting part is in thepath of said
elements of the ratchet clutch to a point suffi
projection and a position in which said project
cient to overcome the force of the spring I8 ing part is outside of thepath of said projection.
and actually cause the teeth ‘I6 and 80 to sep-
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